On the back of my HP Color LaserJet CP1215 there is a USB port and a spot where an Ethernet port might possibly be located. It is covered by a black plastic insert, and the metal on the back has the ethernet diagram indicating that would be an ethernet port.

Is it possible to purchase a card or module of some sort and install it inside the printer to add ethernet capability (instead of using a usb to ethernet print server) ?

Questions on Server Fault are expected to relate to server, networking, or related infrastructure administration within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.
If this question can be reworded to fit the rules in the help center, please edit the question.